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  1. /*
  2.  * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVUTIL_ATOMIC_H
  22. #define AVUTIL_ATOMIC_H
  23.  
  24. #include "config.h"
  25.  
  26. #if HAVE_ATOMICS_NATIVE
  27.  
  28. #if HAVE_ATOMICS_GCC
  29. #include "atomic_gcc.h"
  30. #elif HAVE_ATOMICS_WIN32
  31. #include "atomic_win32.h"
  32. #elif HAVE_ATOMICS_SUNCC
  33. #include "atomic_suncc.h"
  34. #endif
  35.  
  36. #else
  37.  
  38. /**
  39.  * Load the current value stored in an atomic integer.
  40.  *
  41.  * @param ptr atomic integer
  42.  * @return the current value of the atomic integer
  43.  * @note This acts as a memory barrier.
  44.  */
  45. int avpriv_atomic_int_get(volatile int *ptr);
  46.  
  47. /**
  48.  * Store a new value in an atomic integer.
  49.  *
  50.  * @param ptr atomic integer
  51.  * @param val the value to store in the atomic integer
  52.  * @note This acts as a memory barrier.
  53.  */
  54. void avpriv_atomic_int_set(volatile int *ptr, int val);
  55.  
  56. /**
  57.  * Add a value to an atomic integer.
  58.  *
  59.  * @param ptr atomic integer
  60.  * @param inc the value to add to the atomic integer (may be negative)
  61.  * @return the new value of the atomic integer.
  62.  * @note This does NOT act as a memory barrier. This is primarily
  63.  *       intended for reference counting.
  64.  */
  65. int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc);
  66.  
  67. /**
  68.  * Atomic pointer compare and swap.
  69.  *
  70.  * @param ptr pointer to the pointer to operate on
  71.  * @param oldval do the swap if the current value of *ptr equals to oldval
  72.  * @param newval value to replace *ptr with
  73.  * @return the value of *ptr before comparison
  74.  */
  75. void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval);
  76.  
  77. #endif /* HAVE_ATOMICS_NATIVE */
  78.  
  79. #endif /* AVUTIL_ATOMIC_H */
  80.